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Abstract
Early-type galaxies are filled with hot X-ray-emitting gas, but the study of the less plentiful cold gaseous component has been more challenging. Studies of cold material through IRAS 60 and 100 μm observations indicated that half of ordinary E and E/S0 galaxies were detected above the 3 σ level, indicating that cold gas is common, although no correlation was found between the optical and far-infrared fluxes. Most detections were near the instrumental threshold, and given an improved understanding of detection confidence, we reconsider the 60 and 100 μm detection rate. After excluding active galactic nuclei, peculiar systems, and background contamination, only 15 nonpeculiar E and E/S0 galaxies from the RSA catalog are detected above the 98% confidence level, about 12% of the sample. An unusually high percentage of these 15 galaxies possess cold gas (H I CO) and optical emission lines (Hα), supporting the presence of gas cooler than 104 K. The 60-100 μm flux ratios imply a median dust temperature for the sample of 30 K, with a range of 23-28 K.
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